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1D TOCSY correlations of 1. Arrows indicate irradiated resonances. (A) Expansion of 1H-NMR spectrum (600 MHz) of 1; (B) Expansion of 1D TOCSY spectrum of 1 (irradiation of 1.51 ppm); (C) Expansion of 1D TOCSY spectrum of 1 (irradiation of 1.62 ppm).
